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  1. Custom Fit Vehicle Wiring
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  4. Trailer Hitch Wiring
  5. 4 Flat
  6. Powered Converter
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Item # 118501
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Custom Fit Vehicle Wiring

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Tekonsha 4 Flat Custom Fit Vehicle Wiring - 118501
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Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118501 or order online at etrailer.com. Free expert support on all Tekonsha products. Guaranteed Lowest Price and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (151)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118501

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Powered Converter
  • Tekonsha

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.


Features:

  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily
    • Locate connection points in rear cargo area
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes ModuLite to ensure that your vehicle's wiring matches that of your trailer
    • Powered module connects directly to battery to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


Specs:

  • Maximum amperage:
    • Stop/turn lights: 2.1 amps per circuit
    • Tail lights: 5.6 amps per circuit
  • 1-Year limited warranty


Installation

This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side interior trim panels of your rear cargo area. Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery and insert the provided fuse.


Once installation is complete, the 4-way flat connector will be stowed within the spare tire compartment of your rear cargo area.


It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.


ModuLite Powered Tail Light Converter

A ModuLite power module is built into this T-One connector. Because most trailers run on a two-wire system - wherein the brake and turn signals are carried on one wire - the separate brake and turn signals from your vehicle's three-wire system need to be combined so they are compatible with the wiring system of your trailer. This power module functions as a tail light converter to combine the brake and turn signal functions of your automobile so that they run on one wire to properly activate your trailer's tail lights. Note: This will not affect how the tail lights on your vehicle operate.


With a ModuLite, your trailer's lights will be powered without overloading your vehicle's electrical system. Because the module draws power directly from your car's battery and bypasses the electrical routes that are used by a basic wiring harness, there is virtually no draw on your tail light circuits.



118501 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118501 Installation instructions

This Product Fits The Following Vehicles



California residents: click here



Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118501

Average Customer Rating:  4.7 out of 5 stars   (151 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.

by:

All of the wires were long enough for adequate routing. The video instructions were very helpful. I would like to have been supplied with either heat shrink butt connectors or heat shrink tubing for installation outside of the vehicle.



by:
2016 Hyundai Tucson

Wiring for the driver's side is about 3" too short, it's workable but close. The hitch went on very easily, about 20 minutes, and that was laying on the ground to install. I'm 70 years old and did it by myself. Great product.
The tester I26 made checking the wiring very easy.
Items arrived on time and I'm good condition. Very happy with my purchase.



by:
2009 Jeep Compass

We didn’t install it quite like they instructed (only the line to the trailer is outside the vehicle) but it works perfectly and was very easy to install.



by:

Very easy installation and the on-lne video was very helpful.



by:
2018 Hyundai Tucson

Arrived today,looks as said ,will install when weather warms up,will follow the installation video from your site ,which is a great help,thanks again



by:
2018 Hyundai Tucson

Trailer light harness for 2018 Tuscon works great! I installed my own way and are pleased with results. Could not find harness anywhere else. NOT EVEN DEALERS! Thanks etrailer


Comments
Great.
Christina G - 01/26/2021

by:
2016 Hyundai Tucson

it for sure was not easy and all the videos were saying a 2016 but for sure not my 2016 was not as stated . sorry but poor rating , what was the problem as the whole that was for pulling up the wires had wires in that rubber , where you say to pull up I could not even put in a finger but did get the 4 prong connector threw after I pulled off a bunch of plastic that broke as it was not made to come off I think . then the black box was too big threw the whole and as far as the rest iot did not go better POOR would take pics to show how I just taped it to the out side , also that self taping screw I had to drill a hole first as here you said to put just did not work in that area


Comments
Thank you for your review! It seems like there is a little confusion with some of the installation steps. I took a look at the installation instructions and they do mention there could be an existing wire in the grommet. You will need to cut the rubber piece of the t-connector to allow the wire through. The instructions also address needing to drill a hole for the ground in step 8. And finally, the converter box will not go through the grommet hole, it will be taped in the cargo area like shown in the video at time stamp 04:40 of the 2015 Tucson installation video. If you continue watching the install video from there, you will see how and where they drill down the ground wire. I hope this helps!
-- Etrailer Expert Brooke M - 07/20/2021

by:

I'm 70 years old and did the entire install myself other than running the power cable up to the battery from the rear bumper. I would have done that as well but couldn't fit under the vehicle without jacking it up. My local gas station did that for free in about 5 minutes. It went in easily. It is working fine. Very happy with the product. Would definitely recommend it to anyone.



by:

Excellent and easy to install



by:

The video regarding installation of this product was spot on and step by step, watched/rewound the video numerous times and thanks to it installed perfectly. Would recommend a better set up connecting to the battery, otherwise perfect!



by:

It work great and easy to install. No longer have the vehicle I installed it in.



by:
2017 Hyundai Tucson

Really helpful having the video installs on the product page. The kit was very easy to install, the video instructions excellent, worked perfect. Took about an hour to do taking my time.



by:

The [online] video made the whole project a breeze. Every step went as expected. Everything needed was included in the kit.



by:
2017 Hyundai Tucson

Fits as described but 2 sided tape for the control box lasted about 10 minutes. Stuck to the car. Fell off the box. Had to improvise. Otherwise, excellent



by:
2017 Hyundai Tucson

This is a good product but installation was not as easy as suggested. The wires leading to the Driver's side tailight should be longer. The printed instructions were not particularly clear, especially when finding the spot to mount the control box and in dealing with the rubber plug that goes through the body. The video was only helpful to a point because it shows mounting everything on the outside of the vehicle and this kit is designed to be mounted inside. I was able to make things work, but it took some imagination and over three hours.



by:
Hyundai

The product is great - four stars because of installation. The installation is complicated and will take a long time to do well. So, I bailed out and paid a mechanic to do it. It took the mechanic 90 minutes - labor costs were about $150. Our purchase of the light kit, the hitch mount (we installed ourselves) and the mount and ball all totaled under $200 for our Hyundai Tuscon. The dealer price was $579. So I was all in for $350 ish with paying for the light kit installation, still two hundred less than having the dealer do it.



by:
2010 Hyundai Tucson

Instructions were garbage. You cannot run the power wire under the car. I ran my power line through the fire wall down the passenger side. I pulled up all of the paneling and crossed it behind my spare tire. Then I tried it in inside of the car instead of under. Also the method it says about running the passenger side T harness was also frustrating. This kit should come with loom to protect it from the sharp edges. It took 3 hours to run it. First 2 was trying to do it via instructions. Then the other 1 hour was pulling all the paneling. The yellow connectors it came with were trash and wouldn’t take a crimp. I used mine no problems.



by:

When I opened up the shipping box that held both the trailer hitch and the wiring kit I wasn't really super impressed. The box with the wiring kit was already cut open and has a lot of damage from (what I'm assuming) was the staples that held the shipping box closed. None of the wires look damaged at all so that's a plus. Theres also a small but pretty decent gouge in the frame of the hitch. I'll just cover it up with some clear nail polish to keep it from rusting. Still excited to use it though.



by:
2012 Hyundai Tucson

This was clearly designed for my car (2012 Hyundai) as the wires were all the right lengths and the connectors snapped together easily and positively. The directions were surprisingly good. The only issue (a small one) was that the access hole they refer to was visible from under the car but not from the spare tire well as implied in the directions. It was easy to fish the wires through (a coat hanger or kids with small hands make it easy!) and into the trunk.

There was a delay in delivery, but I was contacted a couple of times to inform me of this and to assure me that it was soon to be on its way. I received it about two days later. Appreciated the note to let me know. The delay (about 5 days) was not an issue for me.

Highly recommended- both the product and etrailer.com.


Comments
It has been trouble free and far better than the local trailer retailer harness that was originally installed and failed. I remain very happy.
Ken - 11/01/2017


by:

I received the harness on time with three day shipping. It took about 1 1/2 hours to install. Any time I got confused, I watched your video. The directions are very good, but having the video for my vehicle made it a breeze!
The lights run off the car battery, instead of the existing wires, eliminating short circuits. 100% better than the $15 harness I was going to get.
The light plugs fit perfectly! NO SPLICING WIRES!
I highly recommend this harness!


Comments
Just used a rental trailer last week. The harness actually got compliments on the the harness system from the rental employees for how neat the harness was! I told him I got it online at E-trailer.com. He will be a customer for sure.
Craig M - 10/24/2017


by:
2017 Hyundai Tucson

Everything was ok with this till you try to reinstall tail lights, The T connectors are close to one another and need more length to drop extra plug down into body,
Extra connector stops tail light from mounting between body and light fixture,
Other than that it's ok.


Comments
Connector corroded before I could even use harness had to replace with another connector even with supplied cover. Other than that problem everything else is fine and still would buy from them again
Marc - 06/13/2018


by:
2015 Hyundai Tucson

If, AND ONLY IF, you follow the instructions and install this the way they say, it works fantastically. In my 2015 Hyundai Tucson, I first installed this with the connector mounted in an enclosure and attached to my hitch, creating a more factory look for the harness. In order to do this, I had to leave the converter box mounted underneath the vehicle (instead of inside). It worked great for about a month, at which point the box got wet enough that water caused the connections inside to arc and it melted the converter box.

Round 2, I followed the instructions and installed the box inside the car and pull the wire out through the back hatch when I need it. It's worked great for the last year without any issues. I highly recommend, but only if you follow the instructions! The installation video is your friend!



by:
2017 Hyundai Tucson

When my order arrived a day a part was missing I was taken care of immediately! Very satisfied with etrailer.



by:
2012 Hyundai Tucson

I installed this trailer wiring harness in my 2011 Hyandai Tucson this morning. The install went very well and my trailer lights work now. I was not sure I could do the job and was leaning to taking it to a shop and paying them to install a new wiring harness. After talking to Mike at etrailer he answered my questions and I decided to order and give it a go myself. The installation video on the 2012 Tucson was very clear and thorough and gave me the confidence I needed to start the job. Other than that my tail light assemblies took a lot more pulling to remove than in the video, it went just like the video. I like how the control unit is housed inside the car and not hanging in the rear fender like my old one where it was exposed to snow and road salt which eventually led to it failing. I am very pleased with the product, the price, delivery and the installation video. The only thing I did not use was the butt connector. I substituted a heat shrink butt connector as I think that is more weather proof and secure than a standard butt connector and electrical tape. I hope it lasts a long time. The installation videos are awesome.



by:

I was very pleased with the product, it was easy to install, and it fit very well.


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Show More Reviews

Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring



  • Why is a Dedicated Power Wire Needed to Install Part # 118501 on a Hyundai Tuscon
    The reason the T-One Vehicle Wiring Harness, # 118501 requires a power wire is that your Tuscon requires a harness that provides the power from the vehicle battery and keeps the amperage draw from the trailer lights off of the taillight circuits.The wiring harness uses the vehicles taillight circuits to trigger the lighting functions for the trailer but will not draw power from the taillight circuits to light the trailer lights. Running the power wire directly to the vehicles positive...
    view full answer...
  • Can Converter Box of Tekonsha Kit # 118501 be Bypassed
    You'll have to replace the # 118501 as bypassing the converter box would not allow the kit to work. The converter box is designed to interpret the taillight wiring circuits of your vehicle and then draw the power needed for the trailer wiring from the battery of your tow vehicle. Without the box it would not function.
    view full answer...
  • Installing T-One Vehicle Wiring Harness On 2016 Hyundai Tucson
    In the attached installation instructions for the T-One Vehicle Wiring Harness, # 118501 on your Tuscon it states there may be a wire passing through the grommet already. This is the Note at step 4 of the instructions. It sounds like you have found the larger grommet that is used for the installation and the grommet should fit in the hole as well as allow you to pass the harness through the hole.
    view full answer...
  • Trailer Wiring Recommendation for 2017 Hyundai Tucson
    For your 2017 Hyundai Tucson the Tekonsha kit part # 118501 is a confirmed fit and would work well. I attached an install video for this kit on a similar 2017 model as your which shows that it fits and works well.
    view full answer...
  • Locating Wiring Grommets for Installation of Tow Ready Wire Harness 118501 in 2016 Hyundai Tucson
    When our tech team installed Tow Ready wiring harness # 118501 in a 2012 model year Tucson the grommet used for running the wiring through the trunk pan was located near the bottom of the frame rail. See the linked video at the 1:35 mark. This may differ slightly on your 2016 model year since it is of a different generation of the Tucson. It is sometimes easier to find those grommets from underneath the car. Since we have not yet seen a 2016 Tucson for installation of this harness we...
    view full answer...
  • Trailer Turn Signals Do Not Work With Brake or Running Lights On a 2012 Hyundai Tucson
    This sounds like a bad ground connection on the trailer since 2 separate harnesses yielded the same results. To make sure it is the trailer and not the wiring harness you can test the installation using a circuit tester like # 40376 if you need one. Unhook the trailer and use the circuit tester to test the 4-Way end of the harness while someone sits in the vehicle and goes through the various functions. Be sure to test the turn signals with the brakes applied and/or the running lights...
    view full answer...
  • Trailer Hitch Recommendation for 2017 Hyundai Tucson Sport
    I think you gave them solid advice...but as far as if a trailer hitch will void the warranty that answer is no. When you install an aftermarket part on your vehicle like a trailer hitch in this case, you are protected by the Magnuson–Moss Warranty Act. This act states, in part, that unless the installation and the part caused a problem then the warranty cannot be voided. I recommend looking it up online. For a hitch I would recommend the Draw Tite part # 75836 which is a confirmed fit...
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  • 2019 Hyundai Tucson Ultimate Trailer Wiring Harness Recommendation
    We have just what you are looking for with the Tekonsha trailer wiring harness part # 118812 as this is a plug and play harness that requires only you to run the power wire up to the vehicle battery. The converter box of this kit is the most reliable option for your vehicle which is why I recommend it over other similar options.
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  • Malfunction of Tow Ready Trailer Wiring Harness # 118501 in 2011 Hyundai Tucson
    Thank you for your recent purchase from etrailer. Many times issues related to wiring harness installation can be traced to a weak ground, so you can make sure the white ground wire is secured to a clean bare metal surface. But in your case it does sound like the converter box may be damaged. Certain faults in trailer wiring could damage a converter. If this is what happened in your case it could result in leakage from the output side of the converter back to the input side where the vehicle...
    view full answer...
  • How to Access the Taillight Wiring on the 2011 Hyundai Tucson for Installing a 5-Way Trailer Harness
    To access the wires that supply power to the tail lights at the rear of the 2011 Hyundai Tuscon, you will need to remove two Phillips head screws that hold the tail light assemblies in place, see photo link. After the screws are removed, carefully work the tail light assembly straight out from the rear of the vehicle, wiggling it slightly side to side. Once you have the tail light assembly pulled away from the vehicle you will be able to access the wiring connectors for installing a 4-Way...
    view full answer...
    Image 1 for
  • Installation Of Tow Ready Custom Fit Vehicle Wiring # 118501 On My 2011 Hyundai Tucson
    The item you selected, Tow Ready Custom Fit Vehicle Wiring, part # 118501, is designed to protect the vehicle wiring as it draws power directly from the vehicle battery. I cannot recommend attaching the power wire to the vehicle tail light harness as it could possibly overload the circuit and/or damage the vehicle wiring. You will want to find a rubber grommet on the floor of the rear cargo area. Then remove the grommet and cut a slice in the grommet to feed the power wire through. You...
    view full answer...
  • Using a Circuit Tester from Wiring Harness Kit to Determine Wire Connections on 2019 Hyundai Tucson
    The Upgraded Modulite Vehicle Wiring Harness Kit w/ 4-Pole Trailer Connector and Installation Kit # 119147KIT comes with a basic circuit tester that has an alligator clip on one end that connects to a ground like the metal frame on your vehicle. Then you will use the sharp point to insert into the wire connection while you run one lighting function at a time. The LED bulb will light to reflect the function it sees on that wire. You can see this in the attached video at the 2:00 mark. The...
    view full answer...
    Image 1 for Image 2 for Image 3 for
  • Troubleshooting Trailer Connector on 2016 Hyundai Tucson Not Sending Power
    It sounds like there is a problem with the OEM wiring on your 2016 Hyundai Tucson. You can try following the wiring that is giving you issues to see if there is damage and check your fuses. If you have a lot of lights on your trailer you may be overloading the circuit which is causing a fuse to blow. If the fuses and wiring looks good then I recommend installing the Tekonsha T-One # 118501 so that you bypass the OEM wiring. This plugs in behind your tail lights and then draws power directly...
    view full answer...
  • Trailer Hitch Fit for 2018 Hyundai Tucson
    The Draw-Tite Trailer Hitch # 75772 that fit your 2013 Hyundai Santa Fe will not fit your brand new 2018 Hyundai Tucson. Not to worry though because there is a Class III, 2" hitch that does fit the '18 Tucson, the Draw-Tite # 75836; I have added a photo showing exactly how this hitch will look when installed on an '18 Tucson so you can check out how your car will look when it has this hitch on. The # 75836 will be mostly concealed but it won't require any type of trimming into your new...
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    Image 1 for
  • Trailer Hitch Recommendation for 2018 Hyundai Tucson for Towing
    For your 2018 Hyundai Tucson the trailer hitch I recommend is the Draw Tite part # 75836 because it has the best towing capacities, is easy to install and has a concealed crosstube which means it will be less visible. I attached a picture to show you what it looks like installed and a link to an install video for you to check out as well. For trailer wiring you'd then want the T-One kit part # 118501 which is a custom fit which means the install won't require splicing and because it has...
    view full answer...
    Image 1 for
  • Recommended Wiring Harness for 2012 Hyundai Tuscon
    We do have universal tail light wiring harnesses available, however for your 2012 Hyundai Tuscon, a powered converter module is required to safeguard the vehicle's wiring and to provide enough power for the trailer lights. Because of this, the universal kit that will include everything needed for installation is the Tekonsha Upgraded Heavy Duty ModuLite Circuit Protected Wiring Harness # 119190KIT, which is actually less cost-efficient than the custom harnesses designed to fit your vehicle....
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  • How To Install Trailer Lights On A Trailer Without Tail Lights
    The Roadmaster Deluxe Magnetic Tow Lights part # RM-2120 you are referring to are designed to be placed on the rear of the vehicle in a flat tow situation. If you are wanting to tow a trailer with your 2017 Hyundai Tucson, then you will want the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118501 as this will allow you to hook up your vehicle's tail lights to your trailer tail lights while towing. It is also a plug and play connection therefore you will not need...
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  • Troubleshooting Trailer Wiring on 2017 Hyundai Tucson Where only One Light Stays on Always
    What you described sounds exactly like the converter box of the Curt trailer wiring harness part # C56348 being shorted out. The boxes of these harnesses are designed to basically sacrifice themselves in the event of a short so that it prevents the short from making it to the vehicle's wiring. So the good news is the box did it's job, but the bad news is you have to replace the trailer wiring harness. The kit we offer for your 2017 Tucson that is the most resistant to shorting out is the...
    view full answer...
  • Why Does Trailer Wiring for 2014 Hyundai Tucson Require Running Wire to Vehicle Battery
    Not all vehicles can handle the additional amperage draw of the trailer taillights on the vehicle taillight circuits. Those vehicles need setup that draws power from the battery. Some vehicles have higher rated circuits that can handle this, and others need to have the power drawn straight from the battery to protect the taillight circuits. For your 2014 Hyundai Tucson you need to install a harness that draws power from the battery to protect the taillight circuits like the part # 118501...
    view full answer...
  • Recommended Trailer Hitch And Wiring For 2012 Hyundai Tucson
    The hitches we offer for your 2012 Tuscon may have a much higher towing capacity but you always want to stay below the lowest rated component, in this case your vehicle. The trailer hitch I recommend for your Tuscon is the Draw-Tite Max-E-Loader, part # 75717. This is a Class lll hitch and it has a 2 inch receiver opening. If you plan on doing some towing you might be interested in etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop...
    view full answer...
  • Trailer Hitch Recommendation for a 2016 Hyundai Tucson
    In 2016 there was a generation change for the Hyundai Tucson so the hitch from your 2013 would not also fit the new 2016. For a hitch I would recommend the Draw-Tite # 75836 which is a Class III hitch confirmed to fit your vehicle that would work well for either towing a trailer or carrying a hitch accessory. If you wanted to do some towing you might be interested in etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4...
    view full answer...
  • Does Curt Trailer Hitch Fit 2016 Hyundai Tucson Limited With Dual Exhaust Tips
    I checked with Curt and can verify that the Curt Trailer Hitch Receiver # C12241 is a fit for your 2016 Hyundai Tucson Limited with the dual exhaust tips. I also added a photo a customer sent in of this hitch on their Tucson Limited with the same exahust. I have added a link to the installation instructions as well as an install video for you to check out of the Curt Trailer Hitch Receiver # C12241. If you need a trailer wiring harness as well the correct fit is the T-One Vehicle Wiring...
    view full answer...
    Image 1 for
  • Recommended 2" Trailer Hitch Receiver For 2017 Hyundai Tucson Sport W/ Dual Exhaust
    For your 2017 Hyundai Tucson Sport with the Dual Exhaust on the passenger side I recommend the Draw-Tite Max-Frame Trailer Hitch Receiver # 75836. This hitch has a 525lb tongue weight rating and 3500lb trailer weight rating making it a perfect option for carrying a bike rack, a cargo carrier, or even a ball mount for towing a trailer. If you are planning on towing with your Tucson you will also need a vehicle wiring harness # 118501, and a ball mount, hitch ball, and hitch pin and clip...
    view full answer...
  • Troubleshooting No Left Brake Light Power After Installing Tekonsha 118501 on 2011 Hyundai Tucson
    It sounds like you've installed a T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118501 and in order to troubleshoot this you're likely going to need a circuit tester like the # PTW2993. If the issue is that your vehicle light isn't working then you'll need to check the Tee connection where you've plugged the # 118501 in and make sure that all of the pins are properly seated. If the issue is on the trailer, you'll want to use the circuit tester to test the 4 way plug...
    view full answer...


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